package com.zxm.web.controller.message.netty;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.netty.handler.stream.ChunkedWriteHandler;

/**
 * @Author silence.Z
 * @Date 2022/9/6 11:40
 * @PackageName:com.zxm.web.controller.message.netty
 * @ClassName: NettyServer
 * @Description: TODO Netty服务器配置
 * @Version 1.0
 */
public class NettyServer {
	private final int port;

	public NettyServer(int port) {
		this.port = port;
	}

	public void start() throws Exception {
		EventLoopGroup bossGroup = new NioEventLoopGroup();

		EventLoopGroup group = new NioEventLoopGroup();
		try {
			ServerBootstrap sb = new ServerBootstrap();
			sb.option(ChannelOption.SO_BACKLOG, 1024);
			sb.group(group, bossGroup) // 绑定线程池
					.channel(NioServerSocketChannel.class) // 指定使用的channel
					.localAddress(this.port)// 绑定监听端口
					.childHandler(new ChannelInitializer<SocketChannel>() { // 绑定客户端连接时候触发操作

						@Override
						protected void initChannel(SocketChannel ch) throws Exception {
							System.out.println("收到新连接");
							//websocket协议本身是基于http协议的，所以这边也要使用http解编码器
							ch.pipeline().addLast(new HttpServerCodec());
							//以块的方式来写的处理器
							ch.pipeline().addLast(new ChunkedWriteHandler());
							ch.pipeline().addLast(new HttpObjectAggregator(8192));
							ch.pipeline().addLast(new MyWebSocketHandler());
							ch.pipeline().addLast(new WebSocketServerProtocolHandler("/ws", "WebSocket", true, 65536 * 10));
						}
					});
			ChannelFuture cf = sb.bind().sync(); // 服务器异步创建绑定
			System.out.println(NettyServer.class + " 启动正在监听： " + cf.channel().localAddress());
			cf.channel().closeFuture().sync(); // 关闭服务器通道
		} finally {
			group.shutdownGracefully().sync(); // 释放线程池资源
			bossGroup.shutdownGracefully().sync();
		}
	}
}
